Allow use of Mojo/V8 ProxyResolvers with URLRequestContextBuilder.

net/proxy/test_mojo_proxy_resolver_factory.cc

Index: net/proxy/test_mojo_proxy_resolver_factory.cc
diff --git a/net/proxy/test_mojo_proxy_resolver_factory.cc b/net/proxy/test_mojo_proxy_resolver_factory.cc
new file mode 100644
index 0000000000000000000000000000000000000000..9a0223a2ef55d5bbc08f0818a472ef151e3ad63e
--- /dev/null
+++ b/net/proxy/test_mojo_proxy_resolver_factory.cc
@@ -0,0 +1,34 @@
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "net/proxy/test_mojo_proxy_resolver_factory.h"
+
+#include "base/memory/ptr_util.h"
+#include "mojo/public/cpp/bindings/strong_binding.h"
+#include "net/proxy/mojo_proxy_resolver_factory_impl.h"
+
+namespace net {
+
+TestMojoProxyResolverFactory* TestMojoProxyResolverFactory::GetInstance() {
+  return base::Singleton<TestMojoProxyResolverFactory>::get();
+}
+
+std::unique_ptr<base::ScopedClosureRunner>
+TestMojoProxyResolverFactory::CreateResolver(
+    const std::string& pac_script,
+    mojo::InterfaceRequest<interfaces::ProxyResolver> req,
+    interfaces::ProxyResolverFactoryRequestClientPtr client) {
+  resolver_created_ = true;
+  factory_->CreateResolver(pac_script, std::move(req), std::move(client));
+  return nullptr;
+}
+
+TestMojoProxyResolverFactory::TestMojoProxyResolverFactory() {
+  mojo::MakeStrongBinding(base::MakeUnique<MojoProxyResolverFactoryImpl>(),
+                          mojo::MakeRequest(&factory_));
+}
+
+TestMojoProxyResolverFactory::~TestMojoProxyResolverFactory() = default;
+
+}  // namespace net